remove images, use zero-doc instead (#452)

readme.md

@@ -1,4 +1,4 @@
-<img align="right" width="150px" src="doc/images/go-zero.png">
+<img align="right" width="150px" src="https://raw.githubusercontent.com/tal-tech/zero-doc/main/doc/images/go-zero.png">
 
 # go-zero
 
@@ -25,7 +25,7 @@ Advantages of go-zero:
 * auto validate the request parameters from clients
 * plenty of builtin microservice management and concurrent toolkits
 
-<img src="doc/images/architecture-en.png" alt="Architecture" width="1500" />
+<img src="https://raw.githubusercontent.com/tal-tech/zero-doc/main/doc/images/architecture-en.png" alt="Architecture" width="1500" />
 
 ## 1. Backgrounds of go-zero
 
@@ -76,7 +76,7 @@ go-zero is a web and rpc framework that integrates lots of engineering practices
 
 As below, go-zero protects the system with couple layers and mechanisms:
 
-![Resilience](doc/images/resilience-en.png)
+![Resilience](https://raw.githubusercontent.com/tal-tech/zero-doc/main/doc/images/resilience-en.png)
 
 ## 4. Future development plans of go-zero
 
@@ -200,7 +200,7 @@ go get -u github.com/tal-tech/go-zero
 
 ## 7. Benchmark
 
-![benchmark](doc/images/benchmark.png)
+![benchmark](https://raw.githubusercontent.com/tal-tech/zero-doc/main/doc/images/benchmark.png)
 
 [Checkout the test code](https://github.com/smallnest/go-web-framework-benchmark)